v3.26.1
Investments (Equity Securities) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Debt and Equity Securities, FV-NI [Line Items]    
Equity Securities, FV-NI, Unrealized Gains (Losses) $ 2,826 $ 3,274
Equity securities 927 858
Common Stock    
Debt and Equity Securities, FV-NI [Line Items]    
Equity Securities, FV-NI, Cost 561 498
Equity Securities, FV-NI, Unrealized Gains (Losses) 235 246
Equity securities 796 744
Non-redeemable preferred Stock    
Debt and Equity Securities, FV-NI [Line Items]    
Equity Securities, FV-NI, Cost 121 106
Equity Securities, FV-NI, Unrealized Gains (Losses) 10 8
Equity securities 131 114
Equity Securities    
Debt and Equity Securities, FV-NI [Line Items]    
Equity Securities, FV-NI, Cost 682 604
Equity Securities, FV-NI, Unrealized Gains (Losses) 245 254
Equity securities $ 927 $ 858